JP2018176227A - Perforating method and perforating device for molten metal vessel steel tapping hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device which are capable of moving an oxygen lance inside a narrow space under a molten metal vessel, accurately insert the same in a position of a steel tapping hole of a ladle and perforating the steel tapping hole by dropping plugging sand.SOLUTION: A perforating method includes: a standby step of positioning an L-shaped oxygen lance pipe having a bent tip formed by bending the tip end side of a main body part, within a substantially horizontal plane; a moving step of moving the oxygen lance pipe within the substantially horizontal plane; a temporary moving step of moving the main body part within the substantially horizontal plane and meanwhile, rotating the main body around the longitudinal axis thereof to locate the same within a substantially vertical plane while positioning a tip port of the main body near a steel tapping hole; a corrective moving step of moving the oxygen lance pipe to a heating position that brings the tip port to oppose the steel tapping hole; and an igniting step of igniting the tip port.SELECTED DRAWING: Figure 2

Description

  TECHNICAL FIELD The present invention relates to a method and an apparatus for forming a hole of a steel outlet provided at the bottom of a molten metal container, and in particular, a method for dropping stuffed sand previously provided to the steel outlet and making the hole open. It relates to the device.

  A ladle is used as a molten metal container for transporting molten steel from a melting furnace to a casting facility. A sliding nozzle, a rotary nozzle, and the like are provided at the steel outlet of the through hole tip that penetrates the bottom of the ladle, and the steel outlet can be opened and closed freely. Here, if the molten steel hardens inside the through hole during transportation, the molten steel inside the container can not be taken out. Therefore, "packing sand" is filled in advance so as to close the through holes. When the sliding nozzle is opened, the packed sand falls along with the molten steel and the molten steel inside the container can be taken out from the lower part thereof.

  For example, in Patent Documents 1 and 2, slag or metal adheres to the through hole of the steel outlet, or falling pieces of the upper graphite electrode enter, etc. These become obstacles and they are sufficiently filled with sand. It describes that it is difficult to fill, and discloses a stuffed sand filling apparatus for automatically filling stuffed sand into the through holes and an apparatus for the confirmation thereof. On the one hand, this "obstacle" can also be an obstacle in the removal of stuffed sand. That is, even when the sliding nozzle is opened, the stuffed sand in the through hole at the bottom of the ladle does not fall down and sometimes the steel outlet remains blocked. Such a phenomenon is considered to occur when the molten steel penetrates into the case of incomplete filling of the packing sand as described above, and the packing sand is caught and solidified, or the packing sand is sintered and solidified.

  If stuffed sand solidifies or sinters in the through holes and becomes lumps, insert an oxygen lance pipe (hereinafter referred to as oxygen lance) with a flame at the tip into the outlet, By heating the packed sand, the lumps are dissociated to make it easy to fall, and the steel outlet is opened. On the other hand, the hole drilling operation to insert the oxygen lance pipe into the steel outlet by hand and open the hole is a work in a high temperature environment requiring strict safety control and requires skill in the work, Mechanization was desired.

  Here, Patent Document 3 discloses a machine for cleaning the outlet with an oxygen lance for removing the metal remaining in the outlet after the molten steel outlet. This cleaning operation is also an operation of inserting an oxygen lance from a steel outlet and heating and red-heating the remaining metal, and performing an erosion, which is similar to the above-described heating and removing operation of the filling sand. Here, while using the oxygen lance that is consumed, the oxygen lance feed mechanism is controlled in accordance with the consumption condition, and the swing mechanism that performs swing by eccentrically adjusting the blow pipe for performing gas cleaning is controlled. In addition, since this cleaning work is the work after pouring molten steel, it is possible to work with the tap hole of the ladle facing substantially horizontally, and the sliding device of the oxygen lance feed mechanism etc. on the extension line of the exit port. Although arranged, in the heating and removing operation of the packing sand, such a device arrangement can not be taken because there is a molten steel tapping.

Unexamined-Japanese-Patent No. 7-4852 Japanese Patent Application Laid-Open No. 7-191976 Japanese Patent Application Laid-Open No. 6-182529

  In the process of heating and removing the packed sand, it is necessary to insert the oxygen lance upward from the lower side to the tapping hole at the bottom of the ladle. At this time, the position of the tapping hole of the ladle as the transport container changes with each movement, and the insertion position of the oxygen lance is not constant, and the ladle and the mold receiving the molten steel in the lower side thereof The movement of the oxygen lance is restricted in a narrow space with the container. Furthermore, the mechanical device for moving the oxygen lance also needs to be arranged so as not to interfere with the ladle and the hot water reservoir.

  The present invention has been made in view of such circumstances, and the purpose thereof is to move the oxygen lance in the narrow space under the molten metal container to accurately locate the outlet of the ladle. SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and an apparatus which can be inserted and allow the packed sand of the steel outlet provided at the bottom of the molten metal container to be dropped and opened.

  The method for forming a molten metal container outlet according to the present invention is a method in which the packed sand of the outlet provided at the bottom of the molten metal container is dropped to open the tip end of the main body A standby step of arranging an L-shaped oxygen lance pipe having a bent distal end in a substantially horizontal plane, a moving step of moving the oxygen lance pipe in the substantially horizontal plane, and the main body in the substantially horizontal plane And move it in a substantially vertical plane by rotating it around its longitudinal axis and positioning the tip end in the vicinity of the steel outlet, and making the front end face the steel outlet A correction movement step of moving the oxygen lance pipe to a heating position, and an ignition step of igniting the tip opening are characterized.

  According to this invention, it is possible to move the oxygen lance in the narrow space under the molten metal container so that the oxygen lance can be accurately inserted at the position of the steel outlet of the ladle, and the steel outlet provided at the bottom of the molten metal container The packed sand can be dropped and opened.

  In the above invention, the ignition step moves the oxygen lance pipe from the heating position to an ignition position at least a tip end of the oxygen lance pipe separated from the vicinity of the steel outlet and stores the movement operation. Igniting the tip opening and applying a flame; moving the oxygen lance pipe to the heating position based on the stored movement operation; and moving the oxygen lance pipe so that the tip opening approaches the packing sand. And D. moving may be included. According to this invention, it is possible to drop and open the filling sand of the steel outlet provided at the bottom of the molten metal container, while making it possible to use a wide range of ignition materials enabling ignition to the oxygen lance pipe .

  In the above invention, the waiting step includes the step of applying an ignition agent to the tip end, and the ignition step moves the oxygen lance pipe so that the tip end approaches the stuffed sand to ignite the tip end. And the step of applying a flame may be included. According to this invention, the movement of the oxygen lance pipe for ignition can be omitted by using the ignition agent which is ignited in proximity to the packing sand, and the packing sand of the steel outlet provided at the bottom of the molten metal container Can be dropped and opened.

  In the above invention, the ignition step may include moving the oxygen lance pipe so as to swing the tip end relative to the stuffed sand. According to this invention, the packed sand of the steel outlet provided at the bottom of the molten metal container can be dropped and opened.

  Further, the apparatus for opening a molten metal container outlet according to the present invention is an apparatus for dropping the filling sand of the outlet provided at the bottom of the molten metal container to open the hole, which is the tip of the main body A bending arm for gripping the rear end side of an L-shaped oxygen lance pipe having a bending tip whose side is bent, and a control unit for controlling the operation of the bending arm, the bending arm being the oxygen lance pipe And the main body can be rotated about its longitudinal axis, and the controller can operate the bending arm in a manner such that the hand grip can be moved to a predetermined position in the three-dimensional space near the bottom of the molten metal container. By control, the oxygen lance pipe is disposed in the substantially horizontal plane, the oxygen lance pipe is moved in the substantially horizontal plane, and the main body portion is rotated around the longitudinal axis while being moved in the substantially horizontal plane. Approximately in the vertical plane The tip opening is positioned in the vicinity of the tapping nozzle while, characterized in that moving the oxygen lance pipe the tip opening to a heating position for facing the taphole.

  According to this invention, it is possible to move the oxygen lance in the narrow space under the molten metal container so that the oxygen lance can be accurately inserted at the position of the steel outlet of the ladle, and the steel outlet provided at the bottom of the molten metal container The packed sand can be dropped and opened.

  In the above-described invention, the control unit controls the operation of the bending arm to move the oxygen lance pipe from the heating position to an ignition position at least the tip end of which is separated from the vicinity of the steel outlet. The movement operation is stored, and the oxygen lance pipe is moved to the heating position based on the stored movement operation after the tip opening is ignited, and the oxygen lance pipe is moved so that the tip opening approaches the packing sand. It may be characterized in that it is moved. According to this invention, it is possible to drop and open the filling sand of the steel outlet provided at the bottom of the molten metal container while making it possible to use any ignition material that enables the oxygen lance pipe to be ignited. .

  In the above-described invention, the control unit may control the movement of the bending arm to move the oxygen lance pipe so as to swing the tip end relative to the packing sand. According to this invention, the packed sand of the steel outlet provided at the bottom of the molten metal container can be dropped and opened.

FIG. 1 is a front view of a piercing device according to the invention; FIG. 7 is a perspective view showing the movement of the oxygen lance in the piercing device according to the invention; FIG. 1 is a flow diagram of a method of drilling in accordance with the present invention. It is a flowchart of the principal part of the perforation method by this invention.

  An example of the hole forming apparatus according to the present invention will be described in detail with reference to FIG.

  As shown in FIG. 1, the perforation device 1 is attached to a support 4. Here, the support stand 4 is a columnar frame which supports the ladle 2 which stores molten steel inside, and the casting mold 3 which pours molten steel from the ladle 2, respectively. The perforation device 1 includes a base 18 fixed to a support 4, a robot arm 10 suspended from the base 18, and an L-shaped bent oxygen lance 19 attached to the tip of the robot arm 10. Here, the ladle 2 is provided at the bottom with a steel outlet 21 opened and closed by a sliding nozzle or the like.

  The robot arm 10 has a first arm 11 rotatable about a vertical axis Z with respect to the base 18, a second arm 12 rotatable about a horizontal axis at the tip of the first arm 11, and a second arm And a third arm 13 pivotable about a horizontal axis at the tip of 12. Furthermore, the tip of the third arm 13 is provided with a chuck 14 rotatable around a horizontal axis with respect to the third arm and rotatable about an axis X extending toward the tip. The rotation and rotation operations are controlled by a control unit (not shown) via a motor and an actuator (not shown). The control unit can control each operation of the robot arm 10 according to a predetermined program, and can also control the operation of the robot arm 10 by manual operation using an input device such as a joystick (not shown). As a result, the robot arm 10 can move the chuck 14 to an arbitrary position within a predetermined space below the ladle 2 and above the mold 3.

  The chuck 14 can hold the main body 19 a of the oxygen lance 19 in the direction of the axis X extending toward its tip, and can supply oxygen to the oxygen lance 19. The oxygen lance 19 is a self-consuming type oxygen lance in which a plurality of steel rods serving as a support material are inserted inside a steel pipe for combustion, and the main body 19a and the tip 19b bent substantially at right angles to the main body 19a. It has an L-shape. Further, as described above, the chuck 14 can be rotated about the horizontal axis with respect to the third arm 13 and can rotate the oxygen lance 19 about the axis X. Therefore, the main body portion 19a and the tip end portion 19b of the oxygen lance 19 can be moved in the horizontal plane while being supported in the substantially horizontal plane.

  In particular, as shown in FIG. 2, from the position A ′ where the oxygen lance 19 is disposed in the horizontal plane by the robot arm 10, the rotation of the first arm and the rotation of the second and third arms about the vertical axis Z The oxygen lance 19 can be moved in the horizontal plane by the expansion and contraction in the horizontal direction by. Furthermore, from the position A where the tip end 19c is located in the vicinity of the vertically lower part of the steel outlet 21, for example, along with the movement of the main body 19a in the horizontal plane by rotation around the vertical axis Z, By rotating the distal end portion 19b around, the distal end port 19c can be moved substantially vertically upward (see dotted line), and can be further moved to the position B where the oxygen lance 19 is disposed in the vertical plane. That is, at the position B, the tip 19 b is directed in the vertical direction.

  Next, a method of using the perforation device 1 will be described with reference to FIGS. 3 and 4 together with FIG.

  In the hole making apparatus 1, the packed sand is solidified in the outlet 21 of the ladle 2 by solidification or sintering, and does not fall naturally even when the sliding nozzle is in the open position, and the outlet 21 is opened. It is used to dissociate and drop the lumped packed sand when it is not allowed to puncture.

  Referring to FIG. 3 together with FIG. 2, first, the oxygen lance 19 is made to stand by at the standby position A 'in the horizontal plane on the lower side of the ladle 2 (S1). That is, both the main body portion 19a and the tip portion 19b are disposed in the horizontal plane.

  Next, the oxygen lance 19 is moved in the horizontal plane, and the tip end 19c is moved to a position A arranged near the vertically lower part of the steel outlet 21 (see FIG. 1) of the ladle 2 (S2). Furthermore, the distal end portion 19 b is rotated around the axis X while the oxygen lance 19 is rotated around the vertical axis Z by the robot arm 10 to move the main body portion 19 a in the horizontal plane. As a result, the oxygen lance 19 is moved to the position B and temporarily moved so as to be disposed in a substantially vertical plane while moving the tip end port 19c substantially vertically upward (S3). At this time, when the tip opening 19c is likely to abut on the bottom of the ladle 2 or the periphery of the steel outlet 21, the oxygen lance 19 is slightly inclined from within the complete vertical plane, substantially vertical, before being abutted. Arrange in the plane. As a result, the tip end 19 c is positioned in the vicinity of the steel outlet 21. The robot arm 10 up to this point may be operated by automatic control by a predetermined program, or may be operated by manual operation using an input device.

  Further, the position of the tip end 19c is corrected by manual operation and moved to the heating position to face the steel outlet 21 (S4). Here, in the temporary movement (S3), when the oxygen lance 19 is disposed at a position slightly inclined from the vertical plane, the tip end 19b is moved so as to face vertically upward. Next, as described later, the tip end 19c of the oxygen lance 19 is ignited to give a flame (S5).

  In the ignition (S5), referring to FIG. 4, first, the oxygen lance 19 is moved to a position where the tip end 19c is separated from the vicinity of the steel outlet 21, for example, an ignition position such as position A '(S5-1) ). At this time, the control unit stores this movement operation so that such movement can be traced in the reverse direction from the ignition position as described later. This movement is, for example, a combination of movement of the main body 19a in a horizontal plane and movement of the tip 19b by rotation around the axis X to move the tip opening 19c substantially vertically downward, and then position the oxygen lance 19 in the horizontal plane. It is preferable to move to A ′.

  Next, oxygen is supplied to the oxygen lance 19 to heat and ignite the tip port 19c, and a flame is applied (S5-2). In particular, when the tip port 19c is disposed from the upper side of the opening of the mold 3 as the ignition position, the igniting agent can be freely selected since it does not affect the alloy component of the molten steel to be tapped. The tip end 19c may be heated and ignited by a heating means such as a burner.

  Next, the movement operation stored in the movement to the ignition position (S5-1) is traced in the reverse direction, and the flame is given again to the heating position where the oxygen lance 19 given the flame is opposed to the steel outlet 21 from the ignition position. (S5-3). Further, the tip end 19c is moved so as to be close to the packing sand in the steel outlet 21 (S5-4).

  Referring to FIG. 3 again, the packed sand 19 is heated by a flame to be etched (S6). That is, the stuffed sand that has become lumps by welding is dissociated and dropped. Thereby, the steel outlet 21 can be opened and molten steel can be poured into the mold 3. In particular, the oxygen lance 19 is moved in a predetermined pattern with the tip end 19c facing the steel outlet 21 to efficiently advance the metal removal. For example, the tip end 19 c is swung in the vertical and horizontal directions or is moved to draw a circle along the inner periphery of the steel outlet 21.

  According to the above, the oxygen lance 19 can be moved in the narrow space under the ladle 2 and the upper side of the mold 3 so that the oxygen lance 19 can be accurately inserted into the ladle 2 outlet 21. The packed sand that has become a lump can be dropped and opened. In particular, the position of the ladle 2 as the transport container changes with each movement, and the position of the steel outlet 21 can not be fixed, and the length of the consumable oxygen lance 19 can also differ with each operation. According to the hole making apparatus 1 described above, the oxygen lance 19 can be easily moved to the correct position opposite to the steel outlet 21. As a result, the work can be efficiently progressed. In addition, the perforation device 1 can be arranged so as not to interfere with the ladle 2 or the mold 3 using the robot arm 10 as described above.

  By the way, in the above, at the time of ignition (S5), the oxygen lance 19 is moved to the ignition position (S5-1 to S5-4), but FIG. It explains together.

  First, an ignition agent is attached to the tip end port 19c of the oxygen lance 19 when waiting (S1) at the waiting position A '. Since this ignition material is burned in the outlet 21 as described later, it may be mixed into the molten steel cast by dropping into the mold 3 or the like, which affects the composition of the alloy of the molten steel. It is preferable that there be nothing, for example, one in which the residue is absorbed by the slag.

  Subsequently, movement in the horizontal plane (S2), temporary movement (S3) and correction movement (S4) are performed in the same manner as described above. Furthermore, while supplying oxygen to the oxygen lance 19, the tip end 19c is inserted into the steel outlet 21 to be close to the packed sand. Then, the ignition agent is burned by the heat of the packing sand, and the tip port 19c can be heated to give a flame, and the oxygen lance 19 can be ignited (S5). Following this, in the same manner as described above, lathe is performed (S6).

  As described above, although it is necessary to limit the ignition agent not to affect the alloy composition of the molten steel even if it is mixed, the movement of the oxygen lance 19 for the ignition can be omitted and the efficiency is high.

  Although the representative embodiments according to the present invention and the modifications based thereon are described above, the present invention is not necessarily limited thereto. For example, one of ordinary skill in the art would be able to find various alternative embodiments and modifications without departing from the spirit of the invention or the appended claims, such as modifying the mechanics of the robot arm 10 .

1 Pore-opening device 2 Ladle 3 Mold 10 Robot arm 19 Oxygen lance 21 outlet

Claims (7)

A method of dropping and opening the packed sand of the steel outlet provided at the bottom of the molten metal container,
A standby step of arranging an L-shaped oxygen lance pipe having a bent tip end portion obtained by bending the tip end side of the main body portion in a substantially horizontal plane;
Moving the oxygen lance pipe in the substantially horizontal plane;
A temporary moving step of rotating the main body portion in the substantially horizontal plane and rotating it around the longitudinal axis to arrange the main body portion in the substantially vertical plane and positioning the tip end in the vicinity of the steel outlet;
A correction movement step of moving the oxygen lance pipe to a heating position where the tip end is opposed to the steel outlet;
And b. An ignition step for igniting the tip end opening.   The ignition step includes moving the oxygen lance pipe from the heating position to an ignition position at least the tip end of which is separated from the vicinity of the steel outlet and storing the movement, and causing the tip end to ignite Applying a flame, moving the oxygen lance pipe to the heating position based on the stored movement, and moving the oxygen lance pipe so that the tip port approaches the stuffed sand. The method according to claim 1, further comprising:   The waiting step includes applying an ignition agent to the tip end, and the ignition step moves the oxygen lance pipe to bring the tip end closer to the packing sand to ignite the tip end to provide a flame. The method according to claim 1, further comprising:   The molten metal container outlet according to claim 2 or 3, wherein the ignition step includes the step of moving the oxygen lance pipe so as to swing the tip opening relative to the packing sand. Opening method. An apparatus for dropping the filling sand of the steel outlet provided at the bottom of the molten metal container to open the hole,
A bending arm configured to grip a rear end side of an L-shaped oxygen lance pipe having a bending front end formed by bending a front end side of the main body, and a control unit configured to control an operation of the bending arm;
The bending arm can move the holding portion of the oxygen lance pipe to a predetermined position in the three-dimensional space near the bottom of the molten metal container and can rotate the main body around its longitudinal axis,
The control unit controls the operation of the bending arm to arrange the oxygen lance pipe in a substantially horizontal plane, move the oxygen lance pipe in the substantially horizontal plane, and move the main body in the substantially horizontal plane. The oxygen lance pipe is disposed at a heating position in which the tip end is positioned in the vicinity of the steel outlet and the tip opening is opposed to the steel outlet while being rotated about the longitudinal axis and disposed in a substantially vertical plane. The opening device of the molten metal container outlet port characterized by moving.   The control unit controls the operation of the bending arm to move the oxygen lance pipe from the heating position to an ignition position at least the tip end of which is separated from the vicinity of the steel outlet and stores the movement. After the ignition on the tip end, the oxygen lance pipe is moved to the heating position based on the stored movement, and the oxygen lance pipe is moved so that the tip end approaches the stuffed sand. An apparatus for forming a molten metal container outlet according to claim 5. 7. The molten metal container according to claim 6, wherein the control unit controls the movement of the bending arm to move the oxygen lance pipe so as to swing the tip opening relative to the packing sand. Hole opening device for steel ports.

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